264 lines
7.0 KiB
C
264 lines
7.0 KiB
C
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/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2023-07-30 sp-cai first version
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*/
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#include <rtdevice.h>
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#ifdef RT_USING_SOFT_I2C
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#if !defined(RT_USING_SOFT_I2C1) && !defined(RT_USING_SOFT_I2C2) &&\
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!defined(RT_USING_SOFT_I2C3) && !defined(RT_USING_SOFT_I2C4) &&\
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!defined(RT_USING_SOFT_I2C5) && !defined(RT_USING_SOFT_I2C6) &&\
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!defined(RT_USING_SOFT_I2C7) && !defined(RT_USING_SOFT_I2C8)
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#error "Please define at least one RT_USING_SOFT_I2Cx"
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/*
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This driver can be disabled at:
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menuconfig -> RT-Thread Components -> Device Drivers -> Using I2C device drivers
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*/
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#endif
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#define DBG_ENABLE
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#define DBG_TAG "I2C_S"
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#ifdef RT_I2C_BITOPS_DEBUG
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#define DBG_LEVEL DBG_LOG
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#endif
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#include <rtdbg.h>
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/* i2c config class */
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struct soft_i2c_config
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{
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rt_base_t scl_pin;
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rt_base_t sda_pin;
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const char *bus_name;
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rt_uint16_t timing_delay; /* scl and sda line delay */
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rt_uint16_t timing_timeout; /* in tick */
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};
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/* i2c dirver class */
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struct rt_soft_i2c
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{
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struct rt_i2c_bus_device i2c_bus;
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struct rt_i2c_bit_ops ops;
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};
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struct soft_i2c_config i2c_cfg[] =
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{
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#ifdef RT_USING_SOFT_I2C1
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{
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.scl_pin = RT_SOFT_I2C1_SCL_PIN,
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.sda_pin = RT_SOFT_I2C1_SDA_PIN,
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.bus_name = RT_SOFT_I2C1_BUS_NAME,
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.timing_delay = RT_SOFT_I2C1_TIMING_DELAY,
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.timing_timeout = RT_SOFT_I2C1_TIMING_TIMEOUT,
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},
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#endif //RT_USING_SOFT_I2C1
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#ifdef RT_USING_SOFT_I2C2
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{
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.scl_pin = RT_SOFT_I2C2_SCL_PIN,
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.sda_pin = RT_SOFT_I2C2_SDA_PIN,
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.bus_name = RT_SOFT_I2C2_BUS_NAME,
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.timing_delay = RT_SOFT_I2C2_TIMING_DELAY,
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.timing_timeout = RT_SOFT_I2C2_TIMING_TIMEOUT,
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},
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#endif //RT_USING_SOFT_I2C2
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#ifdef RT_USING_SOFT_I2C3
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{
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.scl_pin = RT_SOFT_I2C3_SCL_PIN,
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.sda_pin = RT_SOFT_I2C3_SDA_PIN,
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.bus_name = RT_SOFT_I2C3_BUS_NAME,
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.timing_delay = RT_SOFT_I2C3_TIMING_DELAY,
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.timing_timeout = RT_SOFT_I2C3_TIMING_TIMEOUT,
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},
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#endif //RT_USING_SOFT_I2C3
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#ifdef RT_USING_SOFT_I2C4
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{
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.scl_pin = RT_SOFT_I2C4_SCL_PIN,
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.sda_pin = RT_SOFT_I2C4_SDA_PIN,
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.bus_name = RT_SOFT_I2C4_BUS_NAME,
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.timing_delay = RT_SOFT_I2C4_TIMING_DELAY,
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.timing_timeout = RT_SOFT_I2C4_TIMING_TIMEOUT,
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},
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#endif //RT_USING_SOFT_I2C4
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#ifdef RT_USING_SOFT_I2C5
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{
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.scl_pin = RT_SOFT_I2C5_SCL_PIN,
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.sda_pin = RT_SOFT_I2C5_SDA_PIN,
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.bus_name = RT_SOFT_I2C5_BUS_NAME,
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.timing_delay = RT_SOFT_I2C5_TIMING_DELAY,
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.timing_timeout = RT_SOFT_I2C5_TIMING_TIMEOUT,
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},
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#endif //RT_USING_SOFT_I2C5
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#ifdef RT_USING_SOFT_I2C6
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{
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.scl_pin = RT_SOFT_I2C6_SCL_PIN,
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.sda_pin = RT_SOFT_I2C6_SDA_PIN,
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.bus_name = RT_SOFT_I2C6_BUS_NAME,
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.timing_delay = RT_SOFT_I2C6_TIMING_DELAY,
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.timing_timeout = RT_SOFT_I2C6_TIMING_TIMEOUT,
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},
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#endif //RT_USING_SOFT_I2C6
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#ifdef RT_USING_SOFT_I2C7
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{
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.scl_pin = RT_SOFT_I2C7_SCL_PIN,
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.sda_pin = RT_SOFT_I2C7_SDA_PIN,
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.bus_name = RT_SOFT_I2C7_BUS_NAME,
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.timing_delay = RT_SOFT_I2C7_TIMING_DELAY,
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.timing_timeout = RT_SOFT_I2C7_TIMING_TIMEOUT,
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},
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#endif //RT_USING_SOFT_I2C7
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#ifdef RT_USING_SOFT_I2C8
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{
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.scl_pin = RT_SOFT_I2C8_SCL_PIN,
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.sda_pin = RT_SOFT_I2C8_SDA_PIN,
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.bus_name = RT_SOFT_I2C8_BUS_NAME,
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.timing_delay = RT_SOFT_I2C8_TIMING_DELAY,
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.timing_timeout = RT_SOFT_I2C8_TIMING_TIMEOUT,
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},
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#endif //RT_USING_SOFT_I2C8
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};
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static struct rt_soft_i2c i2c_bus_obj[sizeof(i2c_cfg) / sizeof(i2c_cfg[0])] =
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{ 0 };
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/**
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* This function initializes the i2c pin.
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* @param i2c config class.
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*/
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static void pin_init(const struct soft_i2c_config *cfg)
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{
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rt_pin_mode(cfg->scl_pin, PIN_MODE_OUTPUT_OD);
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rt_pin_mode(cfg->sda_pin, PIN_MODE_OUTPUT_OD);
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rt_pin_write(cfg->scl_pin, PIN_HIGH);
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rt_pin_write(cfg->sda_pin, PIN_HIGH);
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}
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/**
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* This function sets the sda pin.
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* @param i2c config class.
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* @param The sda pin state.
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*/
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static void set_sda(void *cfg, rt_int32_t value)
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{
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rt_pin_write(((const struct soft_i2c_config*)cfg)->sda_pin, value);
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}
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/**
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* This function sets the scl pin.
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* @param i2c config class.
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* @param The sda pin state.
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*/
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static void set_scl(void *cfg, rt_int32_t value)
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{
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rt_pin_write(((const struct soft_i2c_config*)cfg)->scl_pin, value);
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}
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/**
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* This function gets the sda pin state.
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* @param i2c config class.
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*/
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static rt_int32_t get_sda(void *cfg)
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{
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return rt_pin_read(((const struct soft_i2c_config*)cfg)->sda_pin);
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}
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/**
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* This function gets the scl pin state.
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* @param i2c config class.
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*/
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static rt_int32_t get_scl(void *cfg)
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{
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return rt_pin_read(((const struct soft_i2c_config*)cfg)->scl_pin);
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}
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static const struct rt_i2c_bit_ops soft_i2c_ops =
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{
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.set_sda = set_sda,
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.set_scl = set_scl,
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.get_sda = get_sda,
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.get_scl = get_scl,
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.udelay = rt_hw_us_delay,
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};
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/**
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* if i2c is locked, this function will unlock it
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*
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* @param i2c config class.
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*
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* @return RT_EOK indicates successful unlock.
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*/
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static rt_err_t i2c_bus_unlock(const struct soft_i2c_config *cfg)
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{
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rt_ubase_t i = 0;
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if(PIN_LOW == rt_pin_read(cfg->sda_pin))
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{
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while(i++ < 9)
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{
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rt_pin_write(cfg->scl_pin, PIN_HIGH);
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rt_hw_us_delay(cfg->timing_delay);
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rt_pin_write(cfg->scl_pin, PIN_LOW);
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rt_hw_us_delay(cfg->timing_delay);
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}
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}
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if(PIN_LOW == rt_pin_read(cfg->sda_pin))
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{
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return -RT_ERROR;
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}
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return RT_EOK;
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}
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/* I2C initialization function */
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int rt_soft_i2c_init(void)
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{
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int err = RT_EOK;
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struct rt_soft_i2c *obj;
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for(int i = 0; i < sizeof(i2c_bus_obj) / sizeof(i2c_bus_obj[0]); i++)
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{
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struct soft_i2c_config *cfg = &i2c_cfg[i];
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pin_init(cfg);
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obj = &i2c_bus_obj[i];
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obj->ops = soft_i2c_ops;
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obj->ops.data = cfg;
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obj->i2c_bus.priv = &obj->ops;
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obj->ops.delay_us = cfg->timing_delay;
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obj->ops.timeout = cfg->timing_timeout;
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if(rt_i2c_bit_add_bus(&obj->i2c_bus, cfg->bus_name) == RT_EOK)
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{
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i2c_bus_unlock(cfg);
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LOG_D("Software simulation %s init done"
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", SCL pin: 0x%02X, SDA pin: 0x%02X"
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, cfg->bus_name
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, cfg->scl_pin
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, cfg->sda_pin
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);
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}
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else
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{
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err++;
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LOG_E("Software simulation %s init fail"
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", SCL pin: 0x%02X, SDA pin: 0x%02X"
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, cfg->bus_name
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, cfg->scl_pin
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, cfg->sda_pin
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);
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}
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}
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return err;
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}
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INIT_PREV_EXPORT(rt_soft_i2c_init);
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#endif // RT_USING_SOFT_I2C
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